Grate



(No Model.)

URNI-IA RATE.

Patented Oct. 18, 1887.

di gy-37 irv UNITED STATES PATENT OFFICE.

LEIVIS T. BURNHAM, OF HYDE PARK, ILLINOIS.

GRATE.

SPECIFICATION forming part of Letters Patent No. 371,667, dated October 18, 1887.

Application filed November 2, 1886. Serial No. 217,787. (No model.)

To all whom it may concern.-

Be it known that I, LEwIs T. BURNHAM, a citizen of the United States, residing at Hyde Park, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Grates; and I hereby declare the following to be a full, clear, and exact description of the same.

My improvement relates to the class of grates having bearing-bars supporting transverse finger bars or clips, in this respect resembling the improvement for which Letters Patent of the United States, No. 344,766, were granted me June 29, 1886, though, as will hereinafter more clearly appear, my present improvements are not confined to grates having oscillatory bearing-bars.

As grates of the above-named class are now constructed, the bearingbars are protected from the effect of the fire, to prevent them from becoming warped, by completely covering them with the superimposed finger bars or clips, or fire-bars, as they are variously termed, the body portions of which (whence the finger portions extend upon opposite sides of the bearing-bars) straddle the bearing-bars and abut against each other, completely covering the bearing-bars, as aforesaid, and cans ing the fire or finger bars to stand the entire brunt of the fire.

It is one of my objects to provide a construction whereby the circulation of air shall be permitted about the bearing portions of the finger-bars, thereby to increase the endurance and consequent durability of the finger-bars.

It is a further object to provide a construction whereby a finger-bar may readily be removed, whether from a stationary or oscillatory bearing-bar, for repair or otherwise, and readjusted or another substituted for it without requiring the grate first to be cooled oft.

My invention consists in the construction and combinations of parts hereinafter set forth and claimed.

In the drawings, Figure 1 is a. broken plan View of a bearing-bar carrying a finger-bar, of which a modified construction is indicated by dotted lines; Fig. 2, a-section taken on the line 2 2 of Fig. 1 and viewed in the direction of the arrows; Fig. 3, a section taken on the line 3 3 of Fig. l and viewed in the direction of the arrows; Fig. 4., a section taken on the line 4 4 of Fig. 3 and viewed in the direction of the arrows; Fig. 5, a sectional view of a bearing-bar supporting a finger-bar, shown broken in side elevation to illustrate the fitting edges of the chamber or recess in the finger-bar, the section being taken on the line 5 5 of Fig. 1; and Fig. 6, a broken perspective view of an oscillatory bearing-bar of my improved construction.

A is a bearing-bar to be supported in position on. trunnions t, extending from its op- 'p0site ends, and B is a finger-bar comprising the main or body portion r, which straddles the bearing-bar, and from opposite sides of which extend the finger portions q, preferably provided with lateral lugs q, as set forth in my aforesaid Letters Patent.

If desired, the body portion 1' may be sufficiently wide to permit the provision upon it of two fingers extending from each side, as indicated by the dotted lines in Fig. 1. This, however, has nothing to do with my present invention, which relates only to the bearingbar and body or hearing portion of the fingerbar.

It will of course be understood that a grate comprises several bearing-bars A, carrying transverse finger-bars supported at the body portions 1" and held in position between lugs or stops 1) near opposite ends of the bearingbars.

I provide the fire bars or clips B in the bearing portions r with tapering recesses 0, and form the bearing-bars A of a corresponding shape, whereby they fit into the bearing portions 12' To further protect the bearing-bars against the effects of the heat, in addition to straddling them with the finger-bars and exposing them underneath to the influence of the air-currents, I chamber out the recesses 0, whereby the'only contact of the bearing portions of the fingerbars B with the bearing-bars A is near the edges of the chambers or recesses o in the parts 1, thus forming between each finger-bar at its bearing portion 1- and the part of the bearingbar A which supports it an air-chamber, as shown, extending from one side of the bearingbar over the top of the same to the other side.

The bearing-bars A are hollowed out on opposite sides to afford the upper edges, m, over which fit the edges of the recesses 0 in the fin- ICO shown, there is ample room for the draft-air to disturb the air in contact with the bearingbars in the recesses o, and, by thus producing its circulation, protecting them and the finger-bars from the effects of the heat of the fir imposed upon the grate.

The effect of the lugs or stops p, cast on the bearing-bars A, besides holding the finger,-

bars together, is to maintain the openings or spaces in the grate relatively the same.

The particular use of the tapered form of recess 0 and bearing-bar A in cross-section, as shown, is to enable fire-bars B to be adjusted in the grate where others have been broken out. By means of the tapered recess a new part may be inserted in place ofa broken piece, and when'it shall become hot it will settle down into position. This construction is also of great usefulness where repairs to the masonry require the grate to be taken out, as the latter may be readily and speedily accomplished. If the recess had straight sides, the finger-bars could only be adjusted when the bearing-bars were cold, and this last-named construction entails great difficulty in takin out and replacing finger-bars.

My improved construction may also be employed where stationary bearing-bars are used with fire-bars fitted upon them, the construction rendering, in all cases, the expense of repairing comparatively small, as any burnedout section may be replaced at a minimum cost.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a grate, the combination of a fingerbar, B, having a bearing portiomr, provided with a recess, 0, tapering from the under surface of the bar into the same to a plane below its upper surface and chambered out on opposite sides, and a solid bearing-bar, A, tapering in cross-section and hollowed out on opposite sides and-straddled by the finger-bar at the recess 0, substantially as and for the purpose set forth.

'2. In a grate, a finger-bar, B, having its bearing portion 0" provided with a tapering recess, 0, chambered out, and with an opening, s, substantially as and for the purpose set forth.

' 3. In a grate, the combination ofa finger-, bar, B, having its bearing portion 1" provided with a tapering recess, 0, chambered out, and with an opening, s,'and a bearingbar, A, tapering in cross-section and hollowed out on opposite sides, and provided with openings 8, substantially as and for the purpose set forth.

LEWIS T. BURNHAM. 

